庚 × 辛
Yang Metal and Yin Metal Compatibility in Korean Saju
The Blade (경금 (gyeonggeum)) · The Jewel (신금 (singeum))
Kindred pairing
The same element in opposite polarities — two expressions of one nature that recognize each other instantly.
The Pairing: The Blade Meets The Jewel
Yang Metal (庚, the blade) brings forged decisiveness that holds its lines. Yin Metal (辛, the jewel) brings refined discernment that registers every nuance. Both belong to the Metal element — the same fundamental energy expressed through two different vessels. One yang charge, one yin — the classical complement. One initiates, one receives and refines, and when the roles are respected the pairing self-balances.
How the Energy Flows
Both stems are Metal, so there's no generation and no control between them — the element cycle is silent, and what's left is polarity. Yang Metal is the yang face of Metal; Yin Metal is the yin face. They are two answers to the same question, which makes the mutual recognition immediate and the division of labor natural: one takes the visible, structural role, the other the subtle, interior one. The friction, when it comes, is sibling friction — each quietly convinced their expression of the shared element is the correct one.
In Love
Yang Metal loves with total loyalty inside clearly drawn lines — the word given once is the word kept. Yin Metal loves precisely — attuned to tone, phrasing, and the exact quality of attention, giving the same fineness back. The match works when each learns to read the other's dialect of care rather than waiting for their own. Yang Metal needs a partner who values a kept promise over a performed one, and asks for time before the verdict. Yin Metal needs a partner whose care is careful, and who understands the standard is self-directed first. Whether each can supply what the other is missing — rather than what they themselves would want — is the real compatibility question, and it's the one the element cycle frames but doesn't answer.
Where It Rubs
With no element-cycle current between them, everything runs on polarity and habit — which means unaddressed sibling rivalry over the shared element's territory. Underneath sit the two individual traps: Yang Metal's is finality — cutting cleanly where mending was possible; Yin Metal's is the inner critic — a standard so fine ordinary roughness reads as violation. Most conflict in this pairing is one trap activating the other.
Making It Work
Divide the element, don't contest it. Yang Metal and Yin Metal thrive when the yang face takes the outward work and the yin face the inward — and stall when they grade each other's expression of Metal against their own. The sibling recognition that makes this pairing easy is the same instinct that makes its arguments oddly personal.
Go Deeper on Each Day Master
This page reads the pairing; the individual archetypes each have a full deep dive — Yang Metal (庚): The Blade and Yin Metal (辛): The Jewel. For how full-chart compatibility readings work beyond Day Masters, see Saju Compatibility: How 궁합 Works.
Frequently Asked Questions
Yang Metal and Yin Metal share the Metal element, which makes for instant mutual recognition and a comfortable, honest baseline. The tradition considers same-element pairings stable but unchallenging — the couple has to import the growth a mixed pairing generates on its own. A full 궁합 reading of all four pillars tells you which version you'd get.
Yang Metal is drawn to refined discernment that registers every nuance — their own element worn entirely differently. Yin Metal, in turn, reads Yang Metal's "Says it once. Means it forever." not as a warning but as the point.
Long-term, this pairing lives or dies on the same axis as its everyday chemistry: whether the couple imports the perspectives their shared Metal nature doesn't supply. Saju would also weigh both full charts, the luck cycles (대운) each person is moving through, and the branch relationships between the pillars — which is what a complete 궁합 reading covers.
Day Masters are 2 of 16 characters in a couple chart. The full 궁합 reading compares all four pillars of both charts.